Larry proposes 50% humidity standard to combat health issues in Spokane buildings

The recent SBCC WSEC-C TAG meeting held on April 4, 2025, brought to light critical discussions surrounding humidification standards in building codes, with a focus on health implications for residents in Washington State. The meeting featured proposals from Larry and Eric, both advocating for changes to current regulations that dictate humidity levels in public buildings.

Larry emphasized the need to raise the humidity threshold from the existing 30% to 50%, citing numerous studies that link higher humidity levels to reduced health risks, including mold and respiratory diseases. He argued that maintaining a 50% humidity level is essential for public health, particularly in areas like Spokane, where dry conditions exacerbate asthma and other health issues. Larry's proposal aims to allow for steam humidification methods, which he believes are more effective and healthier than current practices.

Eric supported the idea of providing mechanical engineers with options for humidification, proposing a simpler code that includes both electric steam and adiabatic methods. He acknowledged the energy efficiency of adiabatic systems but raised concerns about potential health risks, such as Legionella, associated with aerosolized water. Eric's proposal seeks to ensure that engineers can choose the safest and most effective humidification methods for various building types, particularly in healthcare settings.

The discussions highlighted a divide between the needs of Eastern and Western Washington, with some members suggesting a compromise that would allow for different standards based on geographic zones. This proposal aims to address the unique humidity challenges faced by communities on the East Side of the Cascades, where dry conditions are prevalent.

As the meeting progressed, participants expressed the urgency of addressing these issues, with personal anecdotes underscoring the real-world consequences of inadequate humidity control. The dialogue underscored a collective commitment to improving public health through better building practices, with the potential for significant changes to the state's building codes on the horizon.

In conclusion, the SBCC WSEC-C TAG meeting served as a platform for vital discussions on humidification standards, with proposals that could lead to healthier living environments for residents across Washington. The next steps will involve further deliberation on the proposed changes, with an emphasis on balancing safety, efficiency, and the diverse needs of communities statewide.